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Eureka, City of

Sewage treatment plant, Eureka, Illinois. NPDES permit IL0025119, in force until Jul 31, 2027. Last 12 months: over a limit 3 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (10 values), outfall A01 form 0 monthly (7 values), outfall B01 form 0 monthly (23 values), outfall INF form L monthly (4 values)
Renewal application due
Feb 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 48 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
April 2026Oxygen, dissolved [DO], minimum weekly average6.1 mg/L≥ 6.25 mg/L2%
May 2026Oxygen, dissolved [DO], minimum weekly average6 mg/L≥ 6.25 mg/L4%
June 2026Oxygen, dissolved [DO], minimum weekly average5.5 mg/L≥ 6.25 mg/L12%

Limits in force (58)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Chlorine, total residualmonthly average≤ .75 mg/Lall year001
Flow, totalmonthly totalreport only (MGD)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearA01
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all yearA01
Solids, total suspendedmonthly averagereport only (mg/L)all yearA01
Solids, total suspendedweekly averagereport only (mg/L)all yearA01
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearA01
Coliform, fecal generaldaily maximum≤ 400 #/100mLall yearA01
Flow, totalmonthly totalreport only (Mgal/mo)all yearA01
Oxygen, dissolved [DO]monthly average minimum≥ 6 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]minimum weekly average≥ 6.25 mg/LMar–JulB01
Oxygen, dissolved [DO]minimum weekly average≥ 4.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–JulB01
Oxygen, dissolved [DO]daily minimum≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
pHminimum≥ 6 SUall yearB01
pHmaximum≤ 9 SUall yearB01
Solids, total suspendedmonthly average≤ 12 mg/Lall yearB01
Solids, total suspendeddaily maximum≤ 24 mg/Lall yearB01
Solids, total suspendedmonthly average≤ 184 lb/dall yearB01
Solids, total suspendeddaily maximum≤ 368 lb/dall yearB01
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMar, Apr, May, Sep, OctB01
Nitrogen, ammonia total [as N]monthly average≤ .9 mg/LJun–AugB01
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LMar, Apr, May, Sep, OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LJun–AugB01
Nitrogen, ammonia total [as N]daily maximum≤ 5.2 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]monthly average≤ 23 lb/dMar, Apr, May, Sep, OctB01
Nitrogen, ammonia total [as N]monthly average≤ 14 lb/dJun–AugB01
Nitrogen, ammonia total [as N]monthly average≤ 31 lb/dJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 87 lb/dMar, Apr, May, Sep, OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 87 lb/dJun–AugB01
Nitrogen, ammonia total [as N]daily maximum≤ 80 lb/dJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LMar, Apr, May, Sep, OctB01
Nitrogen, ammonia total [as N]weekly average≤ 2.3 mg/LJun–AugB01
Nitrogen, ammonia total [as N]weekly average≤ 5 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]weekly average≤ 58 lb/dMar, Apr, May, Sep, OctB01
Nitrogen, ammonia total [as N]weekly average≤ 35 lb/dJun–AugB01
Nitrogen, ammonia total [as N]weekly average≤ 77 lb/dJan, Feb, Nov, DecB01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearB01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearB01
Chlorine, total residualdaily maximum≤ .05 mg/Lall yearB01
Coliform, fecal generaldaily maximumreport only (#/100mL)May–OctB01
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]monthly average≤ 153 lb/dall yearB01
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 307 lb/dall yearB01
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF

How strict are these limits?

Cited limits by parameter: Illinois's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IL0025119 · MCP: https://passage-data.com/mcp